function Dictionary() {

var items = {};

this.set = function (key, value) {

items[key] = value;

};

this.get = function (key) {

return this.has(key) ? items[key] : undefined;

}

this.delete = function (key){

if (this.has(key)) {

delete items[key];

return true;

}

return false;

};

this.has = function (key) {

// if (Object.keys(items).indexOf(key) != -1) {

// return true;

// }else{

// return false;

// }

return key in items;

};

this.values = function () {

let values = [];

for( let k in items) {

if (this.has(k)) {

values.push(items[k]);

}

}

return values;

}

this.clear = function() {

items = {};

};

this.size = function () {

return Object.keys(items).length;

};

this.keys = function() {

return Object.keys(items);

};

this.getItems = function() {

return items;

}

}

let dir = new Dictionary();

dir.set('name', 'Cyclone');

dir.set('partner','Joker');

console.log(dir.has('name'));;